设计模式2：工厂方法模式【创建型】

#include <iostream>
using namespace std;

struct ISingleCore
{
public:
virtual ~ISingleCore() { }

virtual void Produce() = 0;
};

class CSingleCoreA : public ISingleCore
{
public:
virtual ~CSingleCoreA() { }

virtual void Produce() { cout<<"Single Core A"<<endl; }
};

class CSingleCoreB : public ISingleCore
{
public:
virtual ~CSingleCoreB() { }

virtual void Produce() { cout<<"Single Core B"<<endl; }
};

struct IFactory
{
public:
virtual ~IFactory() { }

virtual ISingleCore* CreateSingleCore() = 0;
};

class CFactoryA : public IFactory
{
public:
virtual ~CFactoryA() { }

virtual ISingleCore* CreateSingleCore() { return new CSingleCoreA(); }
};

class CFactoryB : public IFactory
{
public:
virtual ~CFactoryB() { }

virtual ISingleCore* CreateSingleCore() { return new CSingleCoreB(); }
};

void main()
{
//
CFactoryA factoryA;

ISingleCore *pSingleCoreA = factoryA.CreateSingleCore();
pSingleCoreA->Produce();
delete pSingleCoreA;

//
CFactoryB factoryB;

ISingleCore *pSingleCoreB = factoryB.CreateSingleCore();
pSingleCoreB->Produce();
delete pSingleCoreB;
}